:root {
  --background: #ffffff;
  --foreground: #1a1b1e;
  --muted: #5f6470;
  --border: #e6e8eb;
  --panel: #f9fafb;
  --primary: #3b6fd8;
  --primary-text: #ffffff;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --background: #141518;
    --foreground: #ececee;
    --muted: #a3a7b0;
    --border: #2a2c31;
    --panel: #1b1d21;
    --primary: #7aa2f0;
    --primary-text: #0d1117;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --background: #141518;
  --foreground: #ececee;
  --muted: #a3a7b0;
  --border: #2a2c31;
  --panel: #1b1d21;
  --primary: #7aa2f0;
  --primary-text: #0d1117;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); }
.top, main, .bottom { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 8px; color: var(--foreground); font-weight: 700; font-size: 18px; text-decoration: none; }
.brand svg { flex: none; }
nav { display: flex; align-items: center; gap: 16px; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a.button, .button {
  padding: 6px 14px;
  border-radius: 8px;
  background: var(--primary);
  color: var(--primary-text);
  font-weight: 600;
}
@media (hover: hover) {
  nav a:not(.button):hover { color: var(--foreground); }
}
.hero { padding: 56px 0 40px; }
h1 { margin: 0 0 16px; font-size: clamp(30px, 6vw, 46px); line-height: 1.15; letter-spacing: -0.02em; text-wrap: balance; }
.lead { max-width: 680px; margin: 0 0 12px; color: var(--muted); font-size: 18px; text-wrap: pretty; }
.zh { color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding-bottom: 40px; }
.features article { padding: 20px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); }
h2 { margin: 0 0 8px; font-size: 18px; }
.features p { margin: 0 0 8px; font-size: 15px; }
.note { padding: 24px 0 48px; border-top: 1px solid var(--border); }
.note p { max-width: 720px; }
.bottom { display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 24px; padding-bottom: 40px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }
.bottom a { color: var(--muted); }
.doc { max-width: 760px; padding-top: 24px; padding-bottom: 48px; }
.doc h1 { font-size: clamp(28px, 5vw, 36px); }
.doc h2 { margin-top: 32px; font-size: 20px; }
.doc h3 { margin: 20px 0 4px; font-size: 16px; }
.doc p, .doc li { text-wrap: pretty; }
.doc .updated { color: var(--muted); }
.doc section[lang="zh-CN"] { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
.callout { padding: 12px 16px; border-left: 3px solid var(--primary); background: var(--panel); border-radius: 0 8px 8px 0; }